drivers/gpio/gpio-clps711x.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  CLPS711X GPIO driver
   4  *
   5  *  Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru>
   6  */
   7
   8 #include <linux/err.h>
   9 #include <linux/module.h>
  10 #include <linux/gpio/driver.h>
  11 #include <linux/platform_device.h>
  12
  13 static int clps711x_gpio_probe(struct platform_device *pdev)
  14 {
  15         struct device_node *np = pdev->dev.of_node;
  16         void __iomem *dat, *dir;
  17         struct gpio_chip *gc;
  18         int err, id;
  19
  20         if (!np)
  21                 return -ENODEV;
  22
  23         id = of_alias_get_id(np, "gpio");
  24         if ((id < 0) || (id > 4))
  25                 return -ENODEV;
  26
  27         gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
  28         if (!gc)
  29                 return -ENOMEM;
  30
  31         dat = devm_platform_ioremap_resource(pdev, 0);
  32         if (IS_ERR(dat))
  33                 return PTR_ERR(dat);
  34
  35         dir = devm_platform_ioremap_resource(pdev, 1);
  36         if (IS_ERR(dir))
  37                 return PTR_ERR(dir);
  38
  39         switch (id) {
  40         case 3:
  41                 /* PORTD is inverted logic for direction register */
  42                 err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
  43                                  NULL, dir, 0);
  44                 break;
  45         default:
  46                 err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
  47                                  dir, NULL, 0);
  48                 break;
  49         }
  50
  51         if (err)
  52                 return err;
  53
  54         switch (id) {
  55         case 4:
  56                 /* PORTE is 3 lines only */
  57                 gc->ngpio = 3;
  58                 break;
  59         default:
  60                 break;
  61         }
  62
  63         gc->base = -1;
  64         gc->owner = THIS_MODULE;
  65         platform_set_drvdata(pdev, gc);
  66
  67         return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
  68 }
  69
  70 static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
  71         { .compatible = "cirrus,ep7209-gpio" },
  72         { }
  73 };
  74 MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
  75
  76 static struct platform_driver clps711x_gpio_driver = {
  77         .driver = {
  78                 .name           = "clps711x-gpio",
  79                 .of_match_table = of_match_ptr(clps711x_gpio_ids),
  80         },
  81         .probe  = clps711x_gpio_probe,
  82 };
  83 module_platform_driver(clps711x_gpio_driver);
  84
  85 MODULE_LICENSE("GPL");
  86 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
  87 MODULE_DESCRIPTION("CLPS711X GPIO driver");
  88 MODULE_ALIAS("platform:clps711x-gpio");